About Optics & Photonics TopicsOSA Publishing developed the Optics and Photonics Topics to help organize its diverse content more accurately by topic area. This topic browser contains over 2400 terms and is organized in a three-level hierarchy. Read more.

Topics can be refined further in the search results. The Topic facet will reveal the high-level topics associated with the articles returned in the search results.

Abstract

In this work we demonstrate the development of a complete analog feedback loop for the control of the carrier-envelope phase (CEP) of a high-average power (20 W) laser operating at 10 kHz repetition rate. The proposed method combines a detection scheme working on a single-shot basis at the full-repetition-rate of the laser system with a fast actuator based either on an acousto-optic or on an electro-optic crystal. The feedback loop is used to correct the CEP fluctuations introduced by the amplification process demonstrating a CEP residual noise of 320 mrad measured on a single-shot basis. The comparison with a feedback loop operating at a lower sampling rate indicates an improvement up to 45% in the residual noise. The measurement of the CEP drift for different integration times clearly evidences the importance of the single-shot characterization of the residual CEP drift. The demonstrated scheme could be efficiently applied for systems approaching the 100 kHz repetition rate regime.

Single-shot CEP variation measured by the kHz camera at an acquisition rate of 180 Hz (a,c) and 100 Hz(b,d). The feedback signal correcting the noise introduced by the amplifier system was provided by the PMTs (a,c) or the kHz camera (b,d) detection systems acting on the Dazzler (a,b) and on the EO crystal(c,d).

Power spectral density (left axis) measured by the kHz camera with (black curves) and without (red curves) feedback loop operating on the amplifier. The error signal was provided to the Dazzler by the kHz camera (a) or by the PMTs detection system (b). The integrated phase noise (dashed blue curve ; right axis) as a function of frequency. (c) Power spectral density measured by an oscilloscope sampling the error signal Δε with (black curve) without (red curve) feedback on the amplifier. The feedback loop was provided to the Dazzler by the PMTs detection system.

Effect of the integration time on the shot-to-shot CEP standard deviation for the Dazzler analog feedback (open circle) and EO crystal analog feedback (full triangle). The solid curve indicates the expected standard deviation evolution as a function of the number of shots N, assuming a single-shot standard deviation of 320 mrad.